On the superconductivity of graphite intercalation compounds with sodium

Belash, I. T.; Bronnikov, A.D.; Zharikov, O.V.; Palnichenko, A.V.

doi:10.1016/0038-1098(87)90355-3

Cited by 70 publications

(35 citation statements)

References 4 publications

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“…By increasing the alkali metal concentration (through high pressure fabrication techniques), the transition temperature has been shown to increase to as much as 5 K in C 2 Na [4]. Lately, in an important recent development, Weller et al have shown that, at ambient conditions, the intercalated compounds C 6 Yb and C 6 Ca exhibit superconductivity with transition temperatures T c ≃ 6.5 K and 11.5 K respectively [5], in excess of that presently reported for other graphitebased compounds.…”

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confidence: 99%

The role of the interlayer state in the electronic structure of superconducting graphite intercalated compounds

et al. 2005

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confidence: 99%

The role of the interlayer state in the electronic structure of superconducting graphite intercalated compounds

et al. 2005

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“…[14] The electronic, catalytic, and mechanical properties of layered systems can be modified and further improved by intercalating alkalis [9,[15][16][17][18][19][20]. The most prominent example, perhaps, is the appearance of superconductivity of alkali doped graphite [21][22][23]. By increasing the alkali metal concentration, the transition temperature can be increased up to 5 K in C 2 Na [23].…”

Section: Introductionmentioning

confidence: 99%

Metallization and stiffness of the Li-intercalated MoS2 bilayer

Петрова

Yakovkin

Zeze

2015

Applied Surface Science

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The band structures, DOS, and Fermi surfaces for the MoS 2 bilayer with adsorbed (a,c,e) and intercalated (b,d,f) Li (1×1) layer. Graphical Abstract (for review)To Reviewer #1:"1. The authors showed the frequencies of phonon modes at Gamma point. In Fig. 6 -We have to confess that the relationship of the phonon frequencies at Gamma with the topic of the paper is only marginal, and therefore have canceled Table 1, Fig. 6 and Fig. 7 (with the related text), as advised. To our view, as a result, the paper has become more focused. Of course, within LDA, one cannot achieve a "chemical accuracy" of the estimates of the interlayer interaction, but for the purposes of the present study of the role of Li intercalation, it is important to use the same approximation for both (pristine and Li-intercalated) systems, and here LDA is a good choice. It should be noted in this regard that, rigorously speaking, vdW description *Response to Reviewers is valid until wave functions of species do not overlap -otherwise, the exchange interaction must be considered instead. Li concentrations, the character of metallization for the adsorbed layer substantially differs from that of the MoS 2 -Li -MoS 2 layered system. In particular, for the adsorbed (1×1) Li monolayer, the increased density of the layer leads to the nonmetal-to-metal transition, which is evident from the appearance of the band crossing E F with an upward dispersion, pertinent to simple metals. It has been demonstrated that intercalated Li substantially increases the interlayer interaction in MoS 2 .Specifically, the estimated 0.12 eV energy of the interlayer interaction in the MoS 2 bilayer increases to 0.60 eV. This result is also consistent with results of earlier DFT calculations and available experimental results for alkali-intercalated graphene layers, which have demonstrated a substantial increase in the stiffness due to intercalation of alkalis.

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“…Such hole doping in the B layers enhances the superconductivity. This is similar to the case of intercalated graphites, 8 where doping (interplane intercalation) by alkali metals causes the graphite to become superconducting.…”

Section: Introductionmentioning

confidence: 50%

Tuning MgB2(0001) surface states through surface termination

2011

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Surface state localization and hybridization on B, Mg, and Li terminated MgB 2 (0001) surfaces are studied within density functional theory (DFT). For the B terminated surface we find a low energy B σ 1 surface state, a sp z surface state, and B σ 2 and σ 3 quantum well states, which are 90% localized in the topmost B layer. Our results demonstrate that by charging the B atomic layer, either by changing the surface termination or through electro-chemical doping, the B σ surface states are shifted down in energy, filled, and delocalize through hybridization as they cross the bulk MgB 2 bulk bands. On the other hand, the sp z surface state should be shifted up in energy, emptied, and gain an increasingly metallic s character by adding a Mg, Mg +1 , or Li terminating atomic layer. These results clearly show both the robust nature of MgB 2 (0001) surface states, and how their localization and energy range may be tuned by surface termination and charging, with implications for the superconducting and plasmonic behavior of MgB 2 .

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On the superconductivity of graphite intercalation compounds with sodium

Cited by 70 publications

References 4 publications

The role of the interlayer state in the electronic structure of superconducting graphite intercalated compounds

The role of the interlayer state in the electronic structure of superconducting graphite intercalated compounds

Metallization and stiffness of the Li-intercalated MoS2 bilayer

Tuning MgB2(0001) surface states through surface termination

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